Description
The mastoid part is the posterolaterally located, thick portion of the temporal bone. It is continuous:
—anteromedially, with the petrous part;
—anteriorly, with both the squamous and tympanic parts.
The mastoid part consists of:
—two surfaces (internal and external);
—two borders (parietal and occipital);
—a mastoid antrum and air cells;
—mastoid and stylomastoid foramina.
The mastoid part articulates:
—superiorly, with the mastoid angle of the parietal bone, forming the parietomastoid suture;
—posteriorly, with the mastoid border of the occipital bone, forming the occipitomastoid suture.
